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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: srinivas.kandagatla@linaro.org,
	Saenz Julienne <nsaenzjulienne@suse.de>,
	devicetree@vger.kernel.org,
	bcm-kernel-feedback-list@broadcom.com,
	linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Rob Herring <robh+dt@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux@armlinux.org.uk,
	catalin.marinas@arm.com, will@kernel.org,
	tim.gover@raspberrypi.com, phil@raspberrypi.com
Subject: [PATCH 3/6] ARM: dts: bcm2711: Add reserved memory template to hold firmware configuration
Date: Tue, 15 Dec 2020 16:56:23 +0100	[thread overview]
Message-ID: <20201215155627.2513-4-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20201215155627.2513-1-nsaenzjulienne@suse.de>

RPi4's co-processor will copy the board's bootloader configuration into
memory for the OS to consume. Introduce a reserved-memory area template
for the co-processor to edit before booting the system so as for Linux
not to overwrite that memory.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index 403bacf986eb..c58e58e8ce39 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -25,6 +25,7 @@ aliases {
 		emmc2bus = &emmc2bus;
 		ethernet0 = &genet;
 		pcie0 = &pcie0;
+		eeprom = &eeprom;
 	};
 
 	leds {
@@ -218,6 +219,19 @@ &pwm1 {
 	status = "okay";
 };
 
+&rmem {
+	/*
+	 * RPi4's co-processor will copy the board's bootloader configuration
+	 * into memory for the OS to consume. It'll also update this node with
+	 * its placement information.
+	 */
+	eeprom: eeprom@0 {
+		reg = <0x0 0x0 0x0>;
+		no-map;
+		status = "disabled";
+	};
+};
+
 /* SDHCI is used to control the SDIO for wireless */
 &sdhci {
 	#address-cells = <1>;
-- 
2.29.2


WARNING: multiple messages have this Message-ID (diff)
From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: srinivas.kandagatla@linaro.org,
	Saenz Julienne <nsaenzjulienne@suse.de>,
	devicetree@vger.kernel.org,
	bcm-kernel-feedback-list@broadcom.com,
	linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Rob Herring <robh+dt@kernel.org>
Cc: tim.gover@raspberrypi.com, catalin.marinas@arm.com,
	linux-kernel@vger.kernel.org, linux@armlinux.org.uk,
	will@kernel.org, phil@raspberrypi.com
Subject: [PATCH 3/6] ARM: dts: bcm2711: Add reserved memory template to hold firmware configuration
Date: Tue, 15 Dec 2020 16:56:23 +0100	[thread overview]
Message-ID: <20201215155627.2513-4-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20201215155627.2513-1-nsaenzjulienne@suse.de>

RPi4's co-processor will copy the board's bootloader configuration into
memory for the OS to consume. Introduce a reserved-memory area template
for the co-processor to edit before booting the system so as for Linux
not to overwrite that memory.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index 403bacf986eb..c58e58e8ce39 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -25,6 +25,7 @@ aliases {
 		emmc2bus = &emmc2bus;
 		ethernet0 = &genet;
 		pcie0 = &pcie0;
+		eeprom = &eeprom;
 	};
 
 	leds {
@@ -218,6 +219,19 @@ &pwm1 {
 	status = "okay";
 };
 
+&rmem {
+	/*
+	 * RPi4's co-processor will copy the board's bootloader configuration
+	 * into memory for the OS to consume. It'll also update this node with
+	 * its placement information.
+	 */
+	eeprom: eeprom@0 {
+		reg = <0x0 0x0 0x0>;
+		no-map;
+		status = "disabled";
+	};
+};
+
 /* SDHCI is used to control the SDIO for wireless */
 &sdhci {
 	#address-cells = <1>;
-- 
2.29.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2020-12-15 16:07 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-15 15:56 [PATCH 0/6] Expose RPi4'd bootloader configuration Nicolas Saenz Julienne
2020-12-15 15:56 ` Nicolas Saenz Julienne
2020-12-15 15:56 ` [PATCH 1/6] dt-bindings: nvmem: Add bindings for rmem driver Nicolas Saenz Julienne
2020-12-15 15:56   ` Nicolas Saenz Julienne
2020-12-15 20:25   ` Rob Herring
2020-12-15 20:25     ` Rob Herring
2020-12-15 21:16     ` Nicolas Saenz Julienne
2020-12-15 21:16       ` Nicolas Saenz Julienne
2020-12-15 15:56 ` [PATCH 2/6] nvmem: Add driver to expose reserved memory as nvmem Nicolas Saenz Julienne
2020-12-15 15:56   ` Nicolas Saenz Julienne
2020-12-15 15:56 ` Nicolas Saenz Julienne [this message]
2020-12-15 15:56   ` [PATCH 3/6] ARM: dts: bcm2711: Add reserved memory template to hold firmware configuration Nicolas Saenz Julienne
2020-12-15 20:27   ` Rob Herring
2020-12-15 20:27     ` Rob Herring
2020-12-15 15:56 ` [PATCH 4/6] ARM: dts: bcm2711: Expose boot-loader configuration Nicolas Saenz Julienne
2020-12-15 15:56   ` Nicolas Saenz Julienne
2020-12-15 15:56 ` [PATCH 5/6] arm64: defconfig: Enable nvmem's rmem driver Nicolas Saenz Julienne
2020-12-15 15:56   ` Nicolas Saenz Julienne
2020-12-15 15:56 ` [PATCH 6/6] ARM: multi_v7_defconfig: " Nicolas Saenz Julienne
2020-12-15 15:56   ` Nicolas Saenz Julienne
2020-12-15 16:05 ` [PATCH 0/6] Expose RPi4'd bootloader configuration Nicolas Saenz Julienne
2020-12-15 16:05   ` Nicolas Saenz Julienne
2020-12-15 18:44 ` Catalin Marinas
2020-12-15 18:44   ` Catalin Marinas
2020-12-15 19:01   ` Nicolas Saenz Julienne
2020-12-15 19:01     ` Nicolas Saenz Julienne
2020-12-15 19:54     ` Rob Herring
2020-12-15 19:54       ` Rob Herring
2020-12-15 21:21       ` Nicolas Saenz Julienne
2020-12-15 21:21         ` Nicolas Saenz Julienne

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